Improvement in hot-air furnaces



lLywnnlc.

Hot-Air Furnaces.

Patented May/6,1874.-

scribed.

ivrrnn 'rares 'r rrIon LEWIS PATRICK, or SPRINGFIELD, oIIIo.'

lMPROVEMENT IN HOT-AIR FURNCES.

Specification forming part of Letters Patent No. 150,603, dated May 5,1574; application filed 'Febrary 12,1874.

To all whom ztmay concern:

Be it known that I, LEWIS PATRIO, of Springfield, county of Clarke andState-of Ohio, have invented certain new and useful Improvements inHot-Air Furnaces, of which the following is a full, clear, and exactdescription, reference being had tothe accompanying drawing, making partof this specification, in whichl with the central invertedheating-frustum, of

bent external fines or pipes, and also of a series of lateral fluesconnecting the vertical through flues with the central heating-frustumfor conveying air thereto, as hereinafter de- The invention furtherconsists in a novel manner of combining the grate of an'ini closedfurnace with the central fire-pot by means of a swiveling or tumblingjoint in rear ofthe lire-pot, and a long pivotal arm or lever extendingoutside of the casin g, and supported by a detachable loop or equivalentdevice, in such manner that the grate may be either rotated on said longarm and pivot for discharging its contents, or depressed at its front bymeans of the long pivotal arm or lever, for the removal of cinderswithout putting out the fire, all as hereinafter set forth.

In the accompanying drawing, A represents the base or ash-pit of thefurnace; B, the firepot, which, by preference, is made in the form oftwo frustums, b b', joined at their bases with the grate C arranged atthe bottom of the lower or inverted frustum b, and thecombustion-chamber D, and coal-chute E at the top ofthe upper one, asshown in Fig. 1. The grate C, w-hich may be of any usual or preferredconstruction, is provided with a long horizontal shaft or pivot, C',extending from a point outside the casing of the furnace to a point inrear of the fire-pot, and is connected at its rear end by a loose swivelor tumbling joint with a' loop or eye, c, which permits the rotation ofthe grate for dumping its contents into the ash-pit, and also permitsthe forward end of the grate-pivot to be depressed, as

'shown in dotted lines, Fig. 1, for cleaning the grate of cinders orashes Without dumping the other contents of the fire-pot. The forwardlong arm of the pivot, extending from the central fire pot and grate tothe outer face of the casing, constitutes a lever for depressing orraising the grate, as desired, and is supported in a pendent hingedloop, cf, which is swung outward and releases the pivot or arm C', whenit is desired to depress the forward edge of the grate. The front end ofthe pivot-lever arm C is squared to receive a wrench for rotating ordumping the grate when desired. The combustion-chamber D is made bypreference cylindrical in form, and is connected at top and bottom withperforated disks D1 D2, the latter, D2, being connected with the top andforming the cover of the combustionchamber D. These disks are providedeach with a series-of perforations for the reception of vertical pipesor tubes F, which extend below the lower disk D1 outside of and aroundthe fire-pot for the reception and passage of cold air from the bottomof the heatingchamber through the combustion-chamber, to be heatedduring such passage. The upper disk D2, directly over the fire-pot, isperforated centrally to receive an inverted frustum of a cone, G, openat the top and closed at the bottom, closely connected with the disk orcover D', to prevent the escape of gases into the heating-chamber. Thelower small end of this inverted frustum G has connected to it eitherdirectly or through the intervention of a closely-fittin g cylindricalcup, G', a number of horizontal air-tubes, F1, which, at their outerends, connect with and receive air to be heated from the ascending nuesF, conducting a portion of the air to the heating-frustum Gr. lfdesired, addition al pipes F2 may be employed, arranged outside of thecombustion-chamber D, with the upper end curved and entering the openend of the inverted frus tum Gr, and passing down any de-v sireddistance within said cone, as shown, for supplying air to said frustum.The iiaring form given to this central heating-chamber G serves todeflect the ascending column of vheat and other products of combustionoutward against and around the `vertical iluesF, which are arrangedaround said inverted frustuni, and in close proximity to its upperlarger end, thereby giving increased efficiency to the Volume of heat bycausing it to act upon both the central heating-chamber and upon thesurrounding vcrtical 'lues. This form of" the heating-chamber G alsoprovides for the rapid expansion and ready discharge, at the upperenlarged open end, of the air admitted at or near its lower end by thelateral and curved lines F1 F2, as explained. At one side of thefrustunl G the disk or cover D2 is provided with a collar at j for thereception of the smoke pipe J', which, passing upward through the top orcover of wall or casing H, is deected and connected with the chimney orsmoke-line.

Aside from the feature particularly described above, the furnace may beconstructed and inclosed in any usual or preferred manner.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combinatiomvwith the central inl verted heating-frustum G, of theouter bent lines F2 and the lateral flues F1 connecting said frustumwith the through-dues F, all arranged and operating as described.

2. In a beating-furnace, organized and operating substantially asdescribed, the combination, with the central re-pot and itsinclosing-case, of a grate pivoted in rear of the repot, and supportedin front by the long piv otal leverarin C and pendent loop c', wherebysaid grate is adapted to be either rotated or depressed at its forwardedge, as set forth.

LEWIS PATRIC.

Witnesses:

A. P. LINN COCHRAN, CHAs. H. BACON.

